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Imagine, you're using Trac in a corporate environment, typically allowing external access to Trac, repositories etc. only after authorization or not at all.

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Still, you may wish to keep business partners, support customers, etc. informed about certain or all developments, and that involves sending potentially sensitive information outside the tightly controlled corporate network. Co-workers in a home office setup may create a similar demand.

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Still, you may wish to keep business partners, support customers, etc. informed about certain or all developments, and that involves sending potentially sensitive (security, privacy ...) information outside the tightly controlled corporate network. Co-workers in a home office setup may create a similar demand.

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Signing emails will help recipients to be sure, that they got unaltered content and got it from you. Encrypting emails will help to distribute announcements to external recipients as freely as to recipients inside without concerns on discretion.